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CONTACT LENS > general CL topics > Flashcards

general CL topics Flashcards

1
Q

it is a thin lens considered to be a medical device placed directly on the surface of the eye

A

Contact Lens

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2
Q

Indications for Contact Lens:

A
  • Any refractive error specially in:
    1. High refractive errors
    2. Irregular astigmatism
    3. anisometropia
  • Aphakia
  • Keratoconus
  • Corneal protection in corneal healing
  • Occupational Requirements
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3
Q

Contra-indications for contact lens:

A
  • Anterior segment infection / inflammation
  • Chronic ocular allergy
  • Certain systemic diseases
  • Ptosis
  • Corneal hypersensitivity
  • Dry eye
  • Poor tear quality
  • Certain occupations
  • Non-compliant patient
  • Un-motivated patient
  • Poor hygiene
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4
Q

Advantages of Contact Lens:

A
  • Unrestricted peripheral field
  • Real image size
  • No spectacle reflection
  • Cosmetically rewarding
  • More comfortable
  • Convenient for sports and some occupational activities
  • Can be used to
    1. Correct medical condition
    2. Protect cornea
    3. Administer topical drugs to the eye
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5
Q

Disadvantages of Contact lens:

A
  • Potential health risk if not worn / cared for as instructed
  • Minor inconvenience of follow up exams
  • Cost more
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6
Q

Classification of Contact lens:

A
  • According to Material
  • According to Design
  • According to Size
  • According to Mode of Use
  • According to Purpose
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7
Q

Contact lens according to Materials:

A

Hard :

  • non gas permeable
  • Gas permeable

Soft :

  • Hydrogel
  • Silicon Hydrogel
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8
Q

Contact Lens according to Design:

A
  • Monocurve
  • Bicurve
  • Tricurve
  • Aspheric
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9
Q

Contact Lens according to Size:

A
  • Corneal
  • Semi-Corneal
  • Scleral
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10
Q

Contact Lens according to Mode of use:

A

Daily wear:

  • Disposable
  • Planned Replacement

Extended wear:

  • Continuous wear
  • Flexible wear
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11
Q

Contact Lens according to Purpose:

A

Optical :

  • Spherical
  • Toric
  • Presbyopic

Therapeutic

Cosmetic

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12
Q
  • used to correct myopia, hyperopia, aphakia and small amount of astigmatism
  • Available in wide range of correction (-20.00D to +20.00D)
A

Spherical Contact Lens

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13
Q

For the correction of significant amount of astigmatism

A

Toric Contact Lens

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14
Q
  • Provide the patient with the ease and convenience of continuous wear without cleaning for extended periods of time
A

Extended Wear SCL

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15
Q

Contact Lens for Presbyopic correction:

A
  1. Monovision or Monofit
  2. Bifocal soft contact lens:
    - Alternating Vision
    - Simultaneous Vision
  3. Multifocal:
  • Center near design
  • Center distance design
  • Modified monovision (Balanced Design)
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16
Q

One eye is fitted with the proper distance vision power and the other eye is fitted with the power necessary for near vision.

A

Monovision or Monofit

17
Q
  • Distance viewing is done through the top part of the lens and near viewing is done through the bottom portion of the lens
A

Alternating Vision - Bifocal SCL

18
Q
  • The patient looks through both the distance and near portion of the lens at the same time
A

Simultaneous Vision - Bifocal SCL

19
Q

kinds of Tinted contact lenses:

A
  • Visibility tint
  • Opaque colored lenses
  • Combination of transparent and opaque tint
20
Q
  • Effective on blue and other relatively light colored eyes
  • Makes handling easier
A

Visibility Tint

21
Q

Lenses that can actually change the apparent color of the eye by making the original color masked while introducing a new color

A

Opaque Colored CL

22
Q

Enhances eye color by allowing the natural color of the eye to mix with the color of the contact lens

A

Combination of transparent and opaque tint CL

23
Q

Modern Contact Lenses:

A
  • Ortho - K contact lens
  • Hybrid Contact lens
  • Google contact lens
  • Triggerfish contact lens
  • Wink activated telescope contact lens
  • Triggerfish contact lens
  • iOptik contact lens
  • Terminator Eyes contact lens
24
Q

a gas permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia, hyperopia and astigmatism

A

Ortho-K contact lens

25
Q

large-diameter lenses that have a rigid gas permeable central zone, surrounded by a peripheral zone made of soft or silicone hydrogel material

A

Hybrid Contact Lens

26
Q

contact lens prototype that monitors glucose levels in tears

A

Google contact lens

27
Q
  • 1.55 millimeter-thick contact lens contains an extremely thin, reflective telescope, which is activated by winks.
  • The wearer winks with the right eye to activate the telescope (2.8x magnification), and with the left eye to deactivate it.

Intended for for low vision and age-related macular degeneration

A

Wink activated telescope contact lens

28
Q
  • a soft disposable silicone contact lens embedding a micro-sensor that measures intraocular pressure
A

The SENSIMED Triggerfish contact lens

29
Q
  • enhances vision and enables visualize their digital world at the same time.
  • It allows light from the display to pass through the center of the pupil, and light from the surrounding environment to pass through the outer portion of the pupil.
  • Each of these sets of light rays produces an image on the retina simultaneously with the other set. They are superimposed to form a single integrated image.
A

iOptik™ contact lens

30
Q
  • show images such as road directions or projecting text messages from smart phones straight to the eye
A

Terminator Eyes Contact lens

31
Q
  • Provide excellent physiological response for patients with refractive errors in the -1.00
  • Has lower protein uptake tendencies which contributes to longer lens life
A

Low Water Content Lenses

32
Q
  • Contact lens that has higher tensile strength
  • Exhibits good material stability
  • no problems with discoloration
A

Low water content contact lens

33
Q
  • High oxygen permeability
  • excellent choice for the thicker plus and minus lenses
  • Low tensile strength
A

High Water content contact lens

34
Q
  • not compatible with all disinfecting systems
  • High incidence of acute red eye and lens discoloration
A

High water content contact lens

35
Q
  • Typically ionic or non-ionic materials
  • combine best of both high and low water materials
  • provide good physiology
  • produced in thin comfortable designs
A

Mild Water Content contact lens

36
Q

Manufacturing process of CL:

A
  • Spincasting
  • Lathe Cutting
  • Cast molding

CONTACT LENS (10 decks)

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